Hi CC,
I hope your screening comes out negative. I'm actually going through almost the same thing you are. I'm 31 year old male and I have been smoking for about 13 years and drink a lot. Back in December I had a white spot like yours appear on the inside of my mouth near the back and it ached for about a day and I ended up getting a cold which i quickly recovered from. I thought it was just from the cold but last month I did a routine check of my mouth and it is still there. Went to the doctors office last month in January and did a quick swab test which came out negative and the doctor told me if it doesn't go away in a few more weeks to come schedule a biopsy. Well it's been past few more weeks and I also tried antibiotics and it's still there. Also, I know it's allergy season but I never had allergies this severe before and sometimes I get mild ear aches. I have a biopsy scheduled for March 5th and I wish both of us the best.
-Sam